Anchor update - I bought a 1/2 inch hammer drill from HF for $29 . I got a good carbide bit from Amazon for $25 .My conclusions : 1 - You don't need a core drill when drilling between interlocking pavers . I set 20 pipe anchors without any problems .Drilling( in non hammer mode ) took less than 60 sec . per paver , no cracks at all ! 2 - I wasn't sure if I should drill into the base material . I decided to drill using a 1 inch wood bit .I drilled down to accommodate the full 18 inch tube . The tubes went in without a hitch and they are rock solid.
